Maintenance; Standard Maintenance; Maintenance Level 1; Maintenance Level 2 - Riello NexPolar Series Installation And Technical Service Instructions

MAINTENANCE

5 MAINTENANCE
5.1

Standard maintenance

In order to ensure the unit's maximum efficiency and reliability, it is
recommended to stipulate a maintenance contract with your local
support centre. The contract includes regular inspections performed
by the service's experts, so that any malfunctions will be promptly
detected and corrected, without any serious consequences.
With a maintenance contract, our experienced technicians will be
able to ensure that the devices will last as long as possible, and
the system will be managed in the most effective manner, even in
terms of costs.
The air-conditioning devices must be serviced by authorized pro-
fessional technicians, while routine checks can be carried out local-
ly by specialized technicians. See the EN 378-4 or ISO 5149 standards.
All the refrigerant filling, removal, and discharging operations must
be performed by qualified personnel, using the correct materials for
the unit in question. Any inadequate handling could result in fluid
leaks or uncontrolled pressure values.
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Prior to performing any interventions upon the machine, al-
ways make sure that the power supply is turned off. If a cooling
circuit is opened, it must be completely drained, refilled, and
tested to check for any leaks. Prior to performing any opera-
tions upon a cooling circuit, the entire refrigerant load must be
drained from the unit itself using a refrigerant recovery unit.
Simple preventive maintenance operations can ensure the unit's
excellent performance:
— improved heating and cooling performance
— reduced energy consumption
— prevention of accidental component functions
— prevention of major interventions, thus ensuring savings in
terms of time and costs
— protection of the environment
The units require five different levels of maintenance.
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Any deviations or failures to observe these maintenance criteria
will nullify the unit's warranty conditions, thus absolving the
manufacturer of any responsibility.
5.1.1

Maintenance level 1

See the notes contained in the section titled "Maintenance level 3
(or higher)" on page p. 54 .
Simple procedures can be performed by the user on a weekly basis:
— Visually check for any traces of oil (indication of a refrigerant
leak),
— Clean the air heat exchanger,
— Check for any protection devices that may have been re-
moved, and any doors or cover that may not have been closed
properly,
— Check the unit's alarms report while the unit is not in function
(refer to the Control Panel's user manual),
— Visually check for any signs of deterioration,
— Check the load on the level indicator
— Check that the difference in water temperature between the
heat exchanger's intake and delivery is correct.
5.1.2

Maintenance level 2

This level requires a specific know-how in the electrical, hydronic,
and mechanical fields.
This level of maintenance can be carried out on a monthly or annu-
al basis, depending on the type of check to be carried out.
Under these conditions, it is recommended to perform the follow-
ing maintenance interventions.
Perform all the level 1 operations, and then perform the following:
Electrical checks
— Tighten the power circuit's electrical connections at least once
a year (see the table containing the tightening torques).
— If necessary, check and tighten all the connections for the
controls/commands (the table containing the tightening tor-
ques).
— Dust and clean the inside of the control units, if necessary.
— Check the status of the contactors, switches, and capacitors.
— Verify the presence and check the conditions of the electrical
protection devices.
— Check that all the electric heaters are functioning properly.
— Check that no water has penetrated into the control unit.
Mechanical checks
— Check the tightness of the fastening bolts of the fan column,
the fan, the compressor, and the control unit.
Water circuit checks
— Always use caution when working on the water circuit, and
take care to avoid damaging the adjacent capacitor.
— Check the water connections.
— Check whether the expansion tank shows any signs of exces-
sive corrosion or gas leaks, and replace it if necessary.
— Drain the impurities from the water circuit.
— Clean the impurities from the water filter.
— Check the fixed speed pump's bearing after 17,500 hours of
operation with water, and the seal of the mechanical pump
after 15,000 hours. Check the operation of the low water flow
safety device.
— Check the status of the pipes' thermal insulation.
— Check the concentration of the anti-freeze solution (ethylene
glycol or propylene glycol).
Cooling circuit
— Thoroughly clean the air heat exchangers with a low pressure
jet and a biodegradable detergent.
— Check the unit's operating parameters and compare them
with the previous values.
— Perform an oil contamination test. Change the oil if necessary.
— Check the operation of the high-pressure switch. Replace it
if faulty.
— Check the cleanliness of the dehydration filter. Replace it if
necessary.
— Keep and maintain a maintenance sheet for each unit.
all of these operations must be performed in strict accordance
with the required safety measures: personal protective equip-
ment, compliance with all the industry regulations, compliance
with the applicable local regulations, and the use of common
sense.
5.1.3

Maintenance level 3 (or higher)

Maintenance at this level requires specific skills, permissions, in-
struments and know-how, and the relative operations may only be
carried out by the manufacturer, its representatives, or other au-
thorized agents. These maintenance operations involve the follow-
ing interventions, for example:
— — The replacement of major components (the compressor,
evaporator, etc.),
— Any interventions upon the cooling circuit (handling of the
refrigerant),
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